Decision Trees

Step-by-step logic flows for analysis and problem solving.

Add dil. HCl to original solution

YES

White precipitate formed?

Group I Present (Pb²⁺)

Confirm with K2CrO4 (Yellow ppt)

No precipitate

Pass H₂S gas through same acidic solution

YES

Precipitate formed?

Group II Present (Cu²⁺, Pb²⁺, As³⁺...)

Check color: Black (CuS, PbS), Yellow (As₂S₃)

No precipitate

Boil off H₂S, add conc. HNO₃, cool, add solid NH₄Cl + excess NH₄OH

SynaptiQ